Resetting the Baseline on a Progress with Progress Applied?

Hi

I was just wondering if anyone cold provide any guidnace on resetting the baseline in P6 when your project already has progress in it?

For example, I have a project that has progress applied for 6 months and now have a Compensation Event (Delay Claim) which needs to be added to baseline.

Does anyone have a step by step process that I should go through to reset the baseline please? I know that if I apply the Current Baseline it will pick up the new activities for the Compensation Event in the future but what should i be doing with the Completed actvities?

When resetting the baseline should Actual Start & Finish Dates for Completed acitvities be the new Planned Start & Finish dates of new baseline?!

Any advice anyone could give would be greatly appreciated.

Many Thanks